[Eeglablist] -inf values in psd array of signal

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Dec 25 19:05:02 PST 2014

Dear James,

I would check presence of outliers and stationarity of the data using
simple methods. See below.


On Thu, Dec 18, 2014 at 4:28 PM, James Bonello <jamesbonello9 at gmail.com>

> Hi EEGLablist,
> I am using CHB-MIT EEG seizure data and finding psd values ranging from
> 1-10 Hz for EEG using 23 channels. I find this using the pwelch() matlab
> function, however I am getting -inf values in certain cells of the array
> 23x300 (300 two sec epochs). Could this be an error using the pwelch
> function or is it possible that signals may contain certain anomalies which
> result in such values? If there's anything that could be done to solve this
> I would like to know and would appreciate any insight!
> Thank you!
> Regards,
> - *James Bonello*
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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